油酸

Based on spatial kinematics of rigid body, a mathematical expression for jointed manikin and its spatial position and orientation is discussed and the translational and rotational transform of the objects in space is studied.

以刚体空间运动学为基础，讨论了作为关节链结构的人体模型及其在空间的位置和方位的数学表示方法，研究了物体在空间的平移变换和旋转变换。

You should really use Black Arrow for that purpose.

那种场合你确实应该要用黑暗之箭。